SAS has a Scandinavian Lounge right at the gates. I haven't used it for the last couple of years, but, when I did, it would fill up to capacity as the departure time approached. I'd head there asap to get a decent seat. You need to meet the usual requirements to get in, of course.

On a related note, I am flying LAX-ARN for the first time in a couple of weeks and have not seen any comments on the options at LAX yet. I know that there is neither an SAS nor an Amex Centurion lounge. Anyone know the best options near the gates with Star Alliance Gold or Priority Pass? I am hoping for a decent United Club like the one at SFO(?)